There are just too many things that appear to be not working if not signed in into iCloud. The list could go on and on, but here is the latest road block that I've bumped into: I've tried installing an extension for Safari and guess what -- I need to sign in with Apple ID on App Store! So, no installing and testing even on this front.
I wish it was much simpler than this, but it looks like the ability to sign in with Apple ID is a must!
Superlu
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